en.wikipedia.org
en.wikipedia.org
http://en.wikipedia.org/wiki/Air_conditioning
www.acca.org
www.acca.org
http://www.acca.org/
www.carrier.com
www.carrier.com
http://www.carrier.com/
www.homedepot.com
www.homedepot.com
http://www.homedepot.com/webapp/wcs/stores/servlet/THDCalcRoomACView?metric=false
www.howstuffworks.com
www.howstuffworks.com
http://www.howstuffworks.com/ac.htm
www.lennox.com
www.lennox.com
http://www.lennox.com/products/air-conditioners/
www.trane.com
www.trane.com
http://www.trane.com/
www.youtube.com
www.youtube.com
http://www.youtube.com/watch?v=1MiQCBIx1mM